Wrapping material for preventing tarnishing of metal articles.



UNITED STATES PATENT OFFICE.

FRANZ FLOR AND ERNST MURMANN, OF VIENNA, AUSTRIA-HUNGARY.

WRAPPING MATERIAL FOR PREVENTING TAR NISHING 0F METAL ARTICLES.

SPECIFICATION formingpart of Letters Patent N 0. 721,171, dated February 24, 1903.

Application filed June 16,1902.

To aZZ whom it may concern.-

Be it known that we,FRANz FLoRand ERNST MURMANN,subjects of the Emperor of Austria- Hungary, residing at Vienna, in the Province of Lower Austria and Empire of Austria- I-Iungary, have invented new and useful Improvements in Wrapping Material to Prevent Tarnishing of Metal Articles, of which the following is a specification.

Our invention relates to the materials into which metal articles, more especially wires, yarns, braids, embroideries, and fabrics, are wrapped or packed, consequently to fabrics, papers, boxes, and chests.

The invention has for its object to prevent the sulfid of hydrogen, traces of which are generated by the rot of the wrapping material or may exist in foul air, as well as the traces of sulfurous or sulfuric acid deriving from the burning of gas or mineral oils and other volatile acids, from getting to the metal and dimming or even blackening it. According to our invention the said packing and wrapping materials are impregnated with a substance which absorbs and neutralizes the said acids with certainty.

By a series of experiments we have found out that of all substances which can be taken into consideration from a technical point of view and which are sufiiciently keeping ammoniated cupric hydroxid is most efiective against sulfid of hydrogen. For preparing Serial No. 111,994. (No model.)

the am moniated cupric hydroxid the hydroxid or carbonate of copper is dissolved in an aqueous solution of ammonia, and the solution is afterward conveniently diluted, or chlorid of copper or another copper salt may be dissolved and ammonia added to the solution until the well-known dark-blue tint appears. In all cases there should be but a small excess of ammonia, owing to which the solution is only weakly caustic and admits of thin silk paper being imbibed therewith without in- FRANZ FLOR. ERNST MURMANN.

Witnesses:

ALVESTO S. I-IOGUE, A. FUNK. 

